Not a Christian so to my understanding evil comes from imperfection. Like how darkness is the lack of light. If god wanted to make something perfect they would have made more of themselves, but instead here we are
More like transcends perfection. It would be slightly more accurate to say god is the source of all knowledge rather than all knowing but even these are inaccurate since I'm taught anything we say about them is likely inaccurate, so we say God is all knowing in our prayers more to remind ourself that God is aware of everything we do or think so we might correct our actions